Updated: June 2009
Cisco IOS Software Release 12.4(15)T will receive extended bug fix support until January 2012.
In addition, Release 12.4(15)T8 (scheduled for release in the December 2008 timeframe) and subsequent rebuilds of Release 12.4(15)T will receive a Maintenance Deployment (MD) release designator. MD defines Cisco IOS Software releases providing bug fix support and ongoing software maintenance.
Cisco is taking this action to indicate that Release 12.4(15)T8 and subsequent Release 12.4(15)T maintenance rebuilds will be treated in a similar manner as Release 12.4 Mainline. Both undergo comprehensive testing and review cycles to continuously improve and increase reliability, quality, and stability. As per Cisco policies, no new technologies or features are added to either Release 12.4 Mainline or maintenance rebuilds of Release 12.4(15)T.
Release 12.4(15)T provides significant software feature benefits and hardware support over Release 12.4 Mainline. For additional details please visit:
Release 12.4(15)T is the last Cisco IOS T release for several Cisco hardware platforms. Please refer to the following product bulletin for more information: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6968/ps6441/product_bulletin_c25_466578.html
For More Information
Cisco IOS Software Releases: http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_cisco_ios_software_category_home.html
Cisco IOS Software Release Designators (Cisco.com login access required): http://www.cisco.com/kobayashi/library/iosplanner/reldesignation.html
Cisco IOS Software Product Lifecycle Dates & Milestones (Product Bulletin #2214) http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps1835/prod_bulletin0900aecd801eda8a_ps6441_Products_Bulletin.html
Cisco hardware end-of-sale and end-of-life announcements are available at: http://www.cisco.com/en/US/products/prod_end_of_life.html
Contact your Cisco account team or email@example.com for additional questions and support.